Neutralization kettle for preparing hydrophilic resin

Abstract

The utility model provides a neutralization kettle for hydrophilic resin preparation, and belongs to the technical field of hydrophilic resin preparation devices. Aiming at the problems of lower efficiency and poorer product quality caused by poorer neutralization temperature control in hydrophilic resin polymerization preparation, the utility model provides a neutralization kettle for hydrophilic resin preparation, which comprises a tank body, the first cooling device is arranged on the outer side of the tank body and is close to the peripheral surface of the tank body; the second cooling device is arranged in the tank body and is close to the inner circumferential surface of the tank body; the third cooling device is arranged on the outer side of the tank body and is communicated with the liquid inlet and the liquid outlet of the tank body; and the pre-cooling device is arranged in the tank body and is close to the liquid inlet of the tank body. Through cooperation of the multiple cooling devices, the heat exchange area is increased, multi-directional heat exchange is achieved, the heat exchange efficiency is improved, the temperature uniformity in the tank body is improved, the temperature control effect is improved, then the production efficiency and the final product quality are improved, meanwhile, through alkali liquor pre-cooling, the load of later reaction is reduced, and heat is effectively controlled.

Description

Technical Field

[0001] The present application relates to the technical field of hydrophilic resin preparation equipment, and in particular to a neutralization kettle for preparing hydrophilic resin. Background Art

[0002] An important preparation method of hydrophilic resin is polymerization using acrylic acid neutralization reaction liquid. The quality and production capacity of acrylic acid neutralization reaction liquid determine the quality and production capacity of hydrophilic resin.

[0003] The acrylic acid neutralization reaction liquid is prepared through an acrylic acid neutralization reaction. However, the acrylic acid neutralization reaction generates heat, which can easily cause local overheating of the reaction liquid, thereby leading to the production of acrylic acid oligomers, which in turn affects the product quality of the hydrophilic resin. Moreover, at higher temperatures, usually around 45°C, it may even cause explosion and pose a safety risk. Therefore, the current acrylic acid neutralization reaction process usually controls the heat release rate by adjusting the amount of acid and alkali. However, this not only results in longer production time and lower production efficiency, but also cannot improve the situation where local overheating leads to poor product quality. Utility Model Content

[0004] The purpose of this application is to solve the problem in the prior art of low efficiency and poor product quality caused by poor temperature control during the polymerization of hydrophilic resins. Therefore, this application provides a neutralization kettle for the preparation of hydrophilic resins. The heat exchange area is increased by cooperating with multiple cooling devices, and heat exchange is carried out in multiple directions, thereby improving heat exchange efficiency, improving temperature uniformity within the tank, avoiding local overheating, improving temperature control, and thus improving production efficiency and final product quality. At the same time, the coordination of a third cooling device and a pre-cooling device achieves pre-cooling of the alkali solution, reduces the load of the later reaction, and effectively controls the heat.

[0005] The present embodiment provides a neutralization kettle for preparing a hydrophilic resin, comprising:

[0006] A tank body, the tank body having a liquid inlet and a liquid outlet arranged opposite to each other, and the tank body having a plurality of first temperature sensors sequentially arranged in a direction from the liquid inlet to the liquid outlet;

[0007] a first cooling device, the first cooling device being arranged outside the tank body and close to the outer peripheral surface of the tank body;

[0008] a second cooling device, the second cooling device being disposed inside the tank body and close to the inner circumference of the tank body;

[0009] a third cooling device, the third cooling device being arranged outside the tank body and being in communication with both the liquid inlet and the liquid outlet of the tank body to circulate and cool the neutralization liquid in the tank body;

[0010] A pre-cooling device is provided in the tank body and close to the liquid inlet of the tank body, the pre-cooling device has a first liquid inlet and a second liquid inlet arranged close to each other, the first liquid inlet is connected to the alkali liquid tank, and the second liquid inlet is connected to the liquid outlet of the third cooling device; and

[0011] The first cooling device and the second cooling device are both connected to a first refrigerant pipeline, the third cooling device is connected to a second refrigerant pipeline, and the first refrigerant pipeline and the second refrigerant pipeline are both connected to a regulating valve.

[0012] By adopting the above technical solution, the heat exchange area is increased and multi-directional heat exchange is achieved through the cooperation of multiple cooling devices, that is, the outer peripheral surface of the tank is cooled by heat exchange through the first cooling device, the inner peripheral surface of the tank is cooled by heat exchange through the second cooling device, and the liquid in the tank is circulated and cooled by heat exchange through the third cooling device, thereby improving the heat exchange efficiency and the temperature uniformity in the tank, avoiding local overheating, improving the temperature control effect, and thus improving the production efficiency and the quality of the final product; at the same time, through the cooperation of the third cooling device and the pre-cooling device, the liquid cooled by heat exchange by the third cooling device is first in contact with the alkali solution, realizing pre-cooling of the alkali solution, reducing the load of the later reaction, effectively controlling the heat, and thus improving the temperature control effect. effect, production efficiency and final product quality; and, each cooling device is connected to the same or different refrigerant pipelines, that is, the first cooling device and the second cooling device are connected to the first refrigerant pipeline, and the third cooling device is connected to the second refrigerant pipeline, which not only simplifies the cooling pipeline and effectively controls the production cost, but also distinguishes heat exchange and ensures the direct heat exchange object, that is, the heat exchange efficiency of the liquid in the tank, thereby ensuring the temperature control effect, production efficiency and final product quality; at the same time, a plurality of first temperature sensors are arranged in the tank body along the liquid inlet and outlet directions, and the first refrigerant pipeline and the second refrigerant pipeline are both connected to the regulating valve, which can realize constant temperature control through the regulating valve and the first temperature sensor, and ensure the effective use of the refrigerant, further controlling the cost.

[0013] In some embodiments, the liquid inlet and the liquid outlet of the tank body are respectively located at two ends of the height direction of the tank body;

[0014] The first cooling device includes a jacket, which is sleeved on the outer peripheral surface of the tank;

[0015] The second cooling device includes a coil, which is arranged close to the inner circumference of the tank body and is reciprocated along the height direction of the tank body;

[0016] The third cooling device includes a heat exchanger, which has a first pipeline and a second pipeline that are independent of each other, the two ends of the first pipeline are respectively connected to the liquid inlet and the liquid outlet of the tank body, and the second pipeline is connected to the second refrigerant pipeline; and the first pipeline has a liquid inlet branch and a first liquid outlet branch and a second liquid outlet branch, the liquid inlet branch is connected to a liquid supply pump, the first liquid outlet branch is connected to the liquid inlet of the tank body, and the second liquid outlet branch is connected to an external device to output the neutralized liquid in the tank body.

[0017] By adopting the above technical solution, a jacket is used to realize the temperature control of the outer peripheral surface of the tank body, a coil is used to realize the temperature control of the inner peripheral surface of the tank body, and a heat exchanger is used to realize the circulation heat exchange of the liquid in the tank body. The structure is simple and the temperature control is reliable. In addition, the reciprocating winding direction of the coil is the same as the liquid inlet and outlet direction of the tank body, thereby improving the temperature uniformity of the liquid in the tank body in the liquid inlet and outlet directions. The tank body also uses the liquid supply pump of the heat exchanger to output the neutralizing liquid through the second liquid outlet branch pipe, which improves the utilization rate of the device, simplifies the structure, and further controls the cost.

[0018] In some embodiments, the pre-cooling device includes an alkali solution input pipe, a liquid distribution plate, and a reflux pipe;

[0019] One end of the alkali solution input pipe is the first liquid inlet, and the other end extends out of the tank body and is connected to the alkali solution tank;

[0020] One end of the reflux pipe is the second liquid inlet, and the other end extends out of the tank body and is connected to the first liquid outlet branch of the first pipeline of the third cooling device;

[0021] The liquid distribution plate is arranged at one end of the reflux pipe and is located directly below the first liquid inlet. The liquid distribution plate is in a fan shape extending outward and downward from the second liquid inlet.

[0022] By adopting the above technical solution, the reflux liquid is dispersed through the inclined fan surface of the liquid distribution plate to form a fluid similar to a waterfall, thereby expanding the contact area with the alkali solution and improving the alkali solution pre-cooling effect; and the liquid distribution plate is installed on the reflux pipe to fix the liquid distribution plate, making it easy to disassemble it from the tank body together with the reflux pipe, thereby improving maintenance convenience.

[0023] In some embodiments, the liquid distribution plate is an arc-shaped curved plate, and the liquid distribution plate is gradually concave inward from the radius edges on both sides thereof.

[0024] By adopting the above technical solution, the reflux liquid is dispersed while avoiding excessive splashing of the reflux liquid, thereby ensuring that a sufficient amount of the reflux liquid contacts the alkali solution and pre-cooling the alkali solution is achieved.

[0025] In some embodiments, the refrigerant inlet of the first cooling device and the second cooling device is arranged near the bottom of the tank body, and the refrigerant outlet is arranged near the top of the tank body;

[0026] The first refrigerant pipeline has two input ports connected to the first cooling device refrigerant inlet and the second cooling device refrigerant inlet respectively, and two output ports connected to the first cooling device refrigerant outlet and the second cooling device refrigerant outlet respectively.

[0027] By adopting the above technical solution, the lower temperature of the first cooling device and the second cooling device as a whole is lower than the upper temperature, which is opposite to the temperature inside the tank, thereby improving the heat exchange efficiency and the temperature uniformity inside the tank.

[0028] In some embodiments, the first liquid outlet branch pipe and the second liquid outlet branch pipe are connected to the liquid outlet of the third cooling device through liquid outlet branch pipes, and the liquid outlet branch pipes are provided with a second temperature sensor and a flow sensor.

[0029] By adopting the above technical solution, the reflux volume and reflux temperature can be obtained by cooperating with the second temperature sensor and flow sensor arranged on the liquid outlet branch, and then cooperating with the liquid supply pump of the liquid inlet branch and the regulating valve of the second refrigerant pipeline to realize the regulation of the reflux volume and refrigerant flow of the third cooling device, thereby ensuring the circulation heat exchange effect and the alkali solution pre-cooling effect.

[0030] Other features and corresponding beneficial effects of the present application are described in the latter part of the specification, and it should be understood that at least some of the beneficial effects become obvious from the description in the specification of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is a schematic structural diagram of an embodiment of the present application;

[0032] Figure 2 This is a schematic diagram of the pipeline connection of an embodiment of the present application.

[0033] Description of reference numerals:

[0034] 10. Tank body; 11. Liquid inlet; 12. Liquid outlet; 13. Support column; 14. Stirring paddle; 15. Acid inlet pipe;

[0035] 20. A first temperature sensor;

[0036] 30. Jacket;

[0037] 40. Coil;

[0038] 50. Heat exchanger; 51. Liquid inlet branch; 52. Liquid outlet branch; 521. First liquid outlet branch; 522. Second liquid outlet branch; 523. Control valve; 53. Liquid supply pump; 54. Second temperature sensor; 55. Flow sensor;

[0039] 60. First refrigerant pipeline;

[0040] 70. Second refrigerant pipeline;

[0041] 80. Control valve;

[0042] 90. Alkali solution inlet pipe; 91. Liquid distribution plate; 92. Reflux pipe. DETAILED DESCRIPTION

[0043] The following specific embodiments illustrate the implementation of the present application. Those skilled in the art can easily understand other advantages and effects of the present application from the contents disclosed in this specification. Although the description of the present application will be introduced in conjunction with the preferred embodiment, this does not mean that the features of this application are limited to this implementation. On the contrary, the purpose of introducing the application in conjunction with the implementation is to cover other options or modifications that may be extended based on the claims of the present application. In order to provide an in-depth understanding of the present application, the following description will contain many specific details. The present application can also be implemented without using these details. In addition, in order to avoid confusion or blurring the focus of the present application, some specific details will be omitted in the description. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other unless there is a conflict.

[0044] It should be noted that in this specification, similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0045] In the description of this application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting this application. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, features defined as "first", "second", etc. may explicitly or implicitly include one or more of the features. In the description of the invention of this application, unless otherwise specified, "multiple" means two or more. Unless otherwise specified and limited, the terms "mounted", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be internal communication between two elements. For those skilled in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] See Figure 1-2 , Figure 1 This is a schematic diagram of the structure of an embodiment of the present application, in which some pipelines and the third cooling device are omitted; Figure 2 This is a schematic diagram of the pipeline connection of an embodiment of the present application.

[0047] An embodiment of the present application provides a neutralization kettle for preparing a hydrophilic resin, comprising a tank body 10, a first cooling device, a second cooling device, and a third cooling device. The cooperation of multiple cooling devices increases the heat exchange area and enables multi-directional heat exchange, that is, the outer peripheral surface of the tank body 10 is cooled by heat exchange by the first cooling device, the inner peripheral surface of the tank body 10 is cooled by heat exchange by the second cooling device, and the liquid in the tank body 10 is circulated and cooled by heat exchange by the third cooling device, thereby improving the heat exchange efficiency and the temperature uniformity in the tank body 10, avoiding local overheating, improving the temperature control effect, and thereby improving production efficiency and the quality of the final product.

[0048] Specifically, the tank body 10 has an oppositely positioned liquid inlet 11 and liquid outlet 12. Multiple first temperature sensors 20 are sequentially positioned within the tank body 10 along the direction from the liquid inlet 11 to the liquid outlet 12, thereby enabling temperature measurements at all directions within the tank body 10. In one embodiment, the liquid inlet 11 and liquid outlet 12 of the tank body 10 are located at opposite ends of the tank body 10 in terms of height, facilitating liquid filling and mixing. Multiple support columns 13 may also be provided at the bottom of the tank body 10 for stable installation, and a stirring paddle 14 may also be provided within the tank body 10 to enhance mixing uniformity and efficiency.

[0049] The first cooling device is disposed outside the tank body 10 and close to the outer peripheral surface of the tank body 10. In a specific embodiment, the first cooling device includes a jacket 30, which is sleeved on the outer peripheral surface of the tank body 10, has a simple structure, and is reliable in temperature control.

[0050] The second cooling device is disposed within the tank body 10, near the inner circumference of the tank body 10. In one embodiment, the second cooling device comprises a coil 40 disposed near the inner circumference of the tank body 10 and reciprocatingly coiling along the height of the tank body 10. This configuration provides a simple structure and reliable temperature control. This configuration is particularly suitable when the liquid inlet 11 and liquid outlet 12 of the tank body 10 are located at opposite ends of the tank body 10 in the height direction, i.e., the reciprocating direction of the coil 40 is the same as the direction of liquid inflow and outflow from the tank body 10, thereby improving the temperature uniformity of the liquid in the tank body 10 in this direction.

[0051] The third cooling device is disposed outside the tank body 10 and is in communication with both the liquid inlet 11 and the liquid outlet 12 of the tank body 10 to circulate and cool the neutralized liquid within the tank body 10. In one embodiment, the third cooling device includes a heat exchanger 50 having a first pipeline and a second pipeline that are independent of each other. The first pipeline has two ends that are respectively in communication with the liquid inlet 11 and the liquid outlet 12 of the tank body 10, and the second pipeline is connected to the second refrigerant pipeline 70. This has a simple structure and reliable temperature control. Preferably, the first pipeline has a liquid inlet branch 51, a first liquid outlet branch 521, and a second liquid outlet branch 522. The liquid inlet branch 51 is connected to a liquid supply pump 53. The first liquid outlet branch 521 is connected to the liquid inlet 11 of the tank body 10. The second liquid outlet branch 522 is connected to an external device to output the neutralized liquid in the tank body 10. That is, the liquid supply pump 53 of the heat exchanger 50 is used to output the neutralized liquid in the tank body 10 through the second liquid outlet branch 522, which improves the utilization rate of the device, simplifies the structure, and further controls the cost.

[0052] In one embodiment, the neutralization kettle is further provided with a pre-cooling device, which is arranged in the tank body 10 and near the liquid inlet 11 of the tank body 10. The pre-cooling device has a first liquid inlet and a second liquid inlet arranged close to each other, the first liquid inlet is connected to the alkali liquid tank, and the second liquid inlet is connected to the liquid outlet of the third cooling device, so that the liquid cooled by heat exchange in the third cooling device first contacts the alkali liquid, thereby pre-cooling the alkali liquid, reducing the load of the later reaction, effectively controlling the heat, and thereby improving the temperature control effect, production efficiency and final product quality.

[0053] In one embodiment, the first cooling device and the second cooling device are both connected to the first refrigerant pipeline 60, and the third cooling device is connected to the second refrigerant pipeline 70, that is, each cooling device is connected to the same or different refrigerant pipelines, which not only simplifies the cooling pipelines and effectively controls production costs, but also distinguishes heat exchange and ensures the heat exchange efficiency of the direct heat exchange object, that is, the liquid in the tank, thereby ensuring the temperature control effect, production efficiency and final product quality.

[0054] In one embodiment, the first refrigerant pipeline 60 and the second refrigerant pipeline 70 are both connected to a regulating valve 80, preferably a PID regulating valve 80. Constant temperature control can be achieved through the regulating valve 80 and the plurality of first temperature sensors 20 in the tank body 10. The temperature can be controlled within ±1°C, ensuring efficient use of the refrigerant and further controlling costs.

[0055] In one embodiment, the refrigerant inlet of the first cooling device and the second cooling device is arranged near the bottom of the tank body 10, and the refrigerant outlet is arranged near the top of the tank body 10, so that the lower temperature of the first cooling device and the second cooling device as a whole is lower than the upper temperature, which is opposite to the temperature inside the tank body 10, thereby improving the heat exchange efficiency and improving the temperature uniformity inside the tank.

[0056] In one embodiment, the first refrigerant pipeline 60 has two input ports connected to the refrigerant inlet of the first cooling device and the refrigerant inlet of the second cooling device, and two output ports connected to the refrigerant outlet of the first cooling device and the refrigerant outlet of the second cooling device, respectively, so as to provide refrigerant to the first cooling device and the second cooling device respectively to ensure the heat exchange effect.

[0057] In one embodiment, the refrigerant used in the neutralization kettle is chilled water, which has a low cost.

[0058] In one embodiment, the first liquid outlet branch 521 and the second liquid outlet branch 522 are connected to the liquid outlet 12 of the third cooling device through the liquid outlet branch 52, and the liquid outlet branch 52 is provided with a second temperature sensor 54 and a flow sensor 55. By cooperating with the second temperature sensor 54 and the flow sensor 55 provided on the liquid outlet branch 52, the reflux volume and reflux temperature can be obtained, and then cooperated with the liquid supply pump 53 of the liquid inlet branch 51 and the regulating valve 80 of the second refrigerant pipeline 70 to achieve the regulation of the reflux volume and refrigerant flow of the third cooling device, thereby ensuring the circulation heat exchange effect and the alkali solution pre-cooling effect. Typically, the liquid supply pump 53 and the flow sensor 55 can be set to interlock constant flow. In one embodiment, the pre-cooling device includes an alkali solution input pipe 90, a liquid distribution plate 91 and a reflux pipe 92.

[0059] One end of the alkali liquid input pipe 90 is a first liquid inlet, and the other end extends out of the tank body 10 and is communicated with the alkali liquid tank. It is understandable that the tank body 10 can also be provided with an acid liquid input pipe 15 to input acid liquid.

[0060] One end of the reflux pipe 92 is a second liquid inlet, and the other end extends out of the tank body 10 and is connected to the first liquid outlet branch 521 of the first pipeline of the third cooling device.

[0061] The liquid distribution plate 91 is disposed at one end of the reflux pipe 92 and is located directly below the first liquid inlet. The liquid distribution plate 91 is fan-shaped and extends outward and downward from the second liquid inlet.

[0062] This method uses the inclined fan surface of liquid distribution plate 91 to disperse the reflux liquid, forming a waterfall-like flow, expanding the contact area with the alkali solution and improving the alkali solution pre-cooling effect. Furthermore, liquid distribution plate 91 is mounted on reflux pipe 92 to ensure secure placement, allowing it to be removed from tank body 10 along with the reflux pipe 92, improving maintenance convenience.

[0063] In one embodiment, the liquid distribution plate 91 is an arc-shaped curved plate, and the liquid distribution plate 91 is gradually concave inward from the radius edges on both sides thereof, so as to achieve dispersion of the reflux liquid while avoiding excessive splashing of the reflux liquid, thereby ensuring that a sufficient amount of the reflux liquid contacts the alkali solution and realizes pre-cooling of the alkali solution.

[0064] In a specific application scenario, at the initial stage of operation of the hydrophilic resin preparation system, relevant parameters are set through the PLC control system. After the dilute acid is added to the neutralization kettle, the liquid supply pump 53 and the heat exchanger 50 are turned on, and the PID regulating valve 80 of the second refrigerant pipeline 70 and the second temperature sensor 54 are constant temperature controlled. At the same time, the coil 40 and the jacket 30 in the kettle are opened for circulation, and the PID regulating valve 80 of the first refrigerant pipeline 60 and the three first temperature sensors 20 distributed in the kettle are constant temperature controlled. The reflux liquid enters the pre-cooling device, and the alkali solution is added to the pre-cooling device at a set flow rate. The system operates to the end of the alkali solution addition and maintains a constant temperature. During the operation of the system, different branches are opened and closed by different control valves 523.

[0065] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some or all of the technical features therein. These modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A neutralization kettle for preparing a hydrophilic resin, characterized in that: include: A tank body, the tank body having a liquid inlet and a liquid outlet arranged opposite to each other, and the tank body having a plurality of first temperature sensors sequentially arranged in a direction from the liquid inlet to the liquid outlet; a first cooling device, the first cooling device being arranged outside the tank body and close to the outer peripheral surface of the tank body; a second cooling device, the second cooling device being disposed inside the tank body and close to the inner circumference of the tank body; a third cooling device, the third cooling device being arranged outside the tank body and being in communication with both the liquid inlet and the liquid outlet of the tank body to circulate and cool the neutralization liquid in the tank body; A pre-cooling device is provided in the tank body and close to the liquid inlet of the tank body, the pre-cooling device has a first liquid inlet and a second liquid inlet arranged close to each other, the first liquid inlet is connected to the alkali liquid tank, and the second liquid inlet is connected to the liquid outlet of the third cooling device; and The first cooling device and the second cooling device are both connected to a first refrigerant pipeline, the third cooling device is connected to a second refrigerant pipeline, and the first refrigerant pipeline and the second refrigerant pipeline are both connected to a regulating valve.

2. The neutralization kettle for preparing a hydrophilic resin according to claim 1, wherein The liquid inlet and the liquid outlet of the tank body are respectively located at the two ends of the height direction of the tank body; The first cooling device includes a jacket, which is sleeved on the outer peripheral surface of the tank; The second cooling device includes a coil, which is arranged close to the inner circumference of the tank body and is reciprocated along the height direction of the tank body; The third cooling device includes a heat exchanger, which has a first pipeline and a second pipeline that are independent of each other, the two ends of the first pipeline are respectively connected to the liquid inlet and the liquid outlet of the tank body, and the second pipeline is connected to the second refrigerant pipeline; and the first pipeline has a liquid inlet branch and a first liquid outlet branch and a second liquid outlet branch, the liquid inlet branch is connected to a liquid supply pump, the first liquid outlet branch is connected to the liquid inlet of the tank body, and the second liquid outlet branch is connected to an external device to output the neutralized liquid in the tank body.

3. The neutralization kettle for preparing a hydrophilic resin according to claim 2, wherein The pre-cooling device includes an alkali solution input pipe, a liquid distribution plate and a reflux pipe; One end of the alkali solution input pipe is the first liquid inlet, and the other end extends out of the tank body and is connected to the alkali solution tank; One end of the reflux pipe is the second liquid inlet, and the other end extends out of the tank body and is connected to the first liquid outlet branch of the first pipeline of the third cooling device; The liquid distribution plate is arranged at one end of the reflux pipe and is located directly below the first liquid inlet. The liquid distribution plate is in a fan shape extending outward and downward from the second liquid inlet.

4. The neutralization kettle for preparing a hydrophilic resin according to claim 3, wherein The liquid distribution plate is an arc-shaped curved plate, and the liquid distribution plate is gradually concave inward from the radius edges on both sides thereof.

5. The neutralization kettle for preparing a hydrophilic resin according to claim 1, wherein The refrigerant inlets of the first cooling device and the second cooling device are arranged near the bottom of the tank body, and the refrigerant outlets are arranged near the top of the tank body; The first refrigerant pipeline has two input ports connected to the first cooling device refrigerant inlet and the second cooling device refrigerant inlet respectively, and two output ports connected to the first cooling device refrigerant outlet and the second cooling device refrigerant outlet respectively.

6. The neutralization kettle for preparing a hydrophilic resin according to claim 2, wherein: The first liquid outlet branch pipe and the second liquid outlet branch pipe are connected to the liquid outlet of the third cooling device through liquid outlet branch pipes, and the liquid outlet branch pipes are provided with a second temperature sensor and a flow sensor.

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